Severity of post-ERCP pancreatitis directly proportional to the invasiveness of endoscopic intervention: a pilot study in a canine model - Buscaglia, J M; Simons, B W; Prosser, B J; Ruben, D S; Giday, S A; Magno, P; Clarke, J O; Shin, E J; Kalloo, A N; Kantsevoy, S V; Gabrielson, K L; Jagannath, S B (Endoscopy, 2008)